GHSA-528q-4pgm-wvg2: Reflected XSS in go-httpbin due to unrestricted client control over Content-Type

1. GitHub Advisory Database
2. GitHub Reviewed
3. GHSA-528q-4pgm-wvg2

Reflected XSS in go-httpbin due to unrestricted client control over Content-Type

Package

gomod github.com/mccutchen/go-httpbin (Go)

Affected versions

< 2.18.0

gomod github.com/mccutchen/go-httpbin/v2 (Go)

Description

The go-httpbin framework is vulnerable to XSS as the user can control the Response Content-Type from GET parameter. This allows attacker to execute cross site scripts in victims browser.

Affected URLs:

• /response-headers?Content-Type=text/html&xss=%3Cimg/src/onerror=alert(%27xss%27)%3E
• /base64/PGltZy9zcmMvb25lcnJvcj1hbGVydCgneHNzJyk+?content-type=text/html
• /base64/decode/PGltZy9zcmMvb25lcnJvcj1hbGVydCgneHNzJyk+?content-type=text/html

Steps to reproduce:

1. Visit one of the above mentioned URLs.
2. XSS window will popup

Suggested fix

• Allow Only Safe Content-Type Values Or give users option to define whitelisted Content-Type headers

Criticality

The following can be major impacts of the issue:

• Access to victim’s sensitive Personal Identifiable Information.
• Access to CSRF token
• Cookie injection
• Phishing
• And any other thing Javascript can perform

References

• GHSA-528q-4pgm-wvg2
• mccutchen/go-httpbin@0decfd1
• https://github.com/mccutchen/go-httpbin/releases/tag/v2.18.0

Published to the GitHub Advisory Database

Mar 21, 2025